For example, the controller 120/220 may perform a reliability verification read operation based on the number of read operations performed on each of the zones Zone_1c to Zone_nc. For example, if the number of read operations performed on each of the zones Zone_1c to Zone_nc reaches a threshold value, the controller 120/220 may perform the reliability verification read operation. With the reliability verification read operation, data of a memory block where the number of error bits exceeding the reference number of error bits occurs may be read reclaimed to another memory block. For example, the number of read operations performed on each of the zones Zone_1c to Zone_nc means the number of read operations performed on all of one or more memory blocks in each of the zones Zone_1c to Zone_nc.

FIG. 13 is a block diagram illustrating a SSD according to an exemplary embodiment of the inventive concept. A SSD system 1000 may include a host 1100 and an SSD 1200. The SSD 1200 may exchange signals with the host 1100 through a signal connector 1001 and may be supplied with electric power PWR through a power connector 1002. The SSD 1200 may include an SSD controller 1210, a plurality of flash memories 1221 to 122m, an auxiliary power supply 1230, a buffer memory 1240, and a wireless module.